William Watts Biggers, who co-created the NBC cartoon Underdog, died on Feb. 10, the Associated Press reports. He was 85.A family friend told the AP that Biggers, who went by "Buck," died unexpectedly at his home in Plymouth, Mass.Born in ...

William Watts Biggers, who co-created the NBC cartoon Underdog, died on Feb. 10, the Associated Press reports. He was 85.

A family friend told the AP that Biggers, who went by "Buck," died unexpectedly at his home in Plymouth, Mass.

Born in Georgia, Biggers was working at a New York City advertising firm when he was assigned to create cartoon characters to promote breakfast cereals for the company's biggest client, General Mills. Among his ideas was Underdog, which debuted on NBC in 1964 and featured a canine superhero who was voiced by comedian Wally Cox. In the cartoons, Underdog often battled villains when coming to the rescue of his girlfriend, Sweet Polly Purebred.